数字调制信号发生器地研制.pdf

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哈尔滨理工大学工学硕士论文 TheDevelopmentofDigitalModulation SignalGenerator Abstract Intheresearchandapplicationdomainofmodemelectronicstechnology,weoften needsignalgenerators,whichhavehighprecisionandmodulatingrfequency.Especially withthedevelopmentofcommunicationstechnology,therearemoreandmorechannels, whichdistributedensely,therefore,itbecomesmoreandmoreimportanttohavehigh precisionandstabilizationcommunicationsfrequency.Butitisdifficulttogeneratethose signalswithtraditionalmethods.Soweintroduceasignalgenerator,whichhas modulationfunctionusingDDStechnologyinthethesis. DirectDigitalSynthesizetechnologyisnewerarfequenciessynthesizetechnology.It controlsphaseincrementofthesignalwithdigital厂】hismethodhasmanyadvantages, suchashighdistinguishingratioofrfequency,switchingrfequencyrapidly,continuous phasewhileswitching,lowphasenoise,fulldigitalandeasytointegrate.Itisadopted widelybecauseoftheseadvantages. BasingonthetheoreticanalysisofDDS,amethodisgiventogeneratestandard signalsbyfrequencysynthesizemethodinthethesis,whichisbasedonphaseaccumulator. Accordingtosystemattributes,DigitalMudulationSignalGenerator,whichhassimple consturctionandgoodperformance,isdesigned.ThehardwareandsoftwareofDigital MudulationSignalGeneratorarediscusseddeeply.Thehardwarecircuitsofthesystemis designedbyadoptingTMS320F206ofCo.TIasitsMCU,andAD9852whichisachipof DDSproducedbyCo.ADasitscore.Weuseadvancedtechnologyofelectronicdesign automationduringthehardwaredesign.Itsimplifiesthedebugofthecircuits,reducesthe cycleofdevelopment,raisestheperformanceandlowthecostbyusingCPLDtocarryout logicalcontrol.NotonlycanthesignalgeneratorgenerateSinwave,FMwave,AMwave, PMwave,butalsoitcancarryout2FSK,2ASK,2PSK.Itcangivewaveswithrfequency upto40MHzandresolvingpowerof1/,Hz.Itsrfequencyspreadwidely.Theattributeof thesignalgeneratorattainsadvancedlevelindomesticcorrespondingdomain. KeywordsDirectDigitalSynthesize;D

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